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v3.23.3

Revenue - Contract Estimates (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Revenue |  |
Accrued sales incentives | $ 1.3 | $ 1.3

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales incentives. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
Name: | wch_AccruedSalesIncentivesCurrent
Namespace Prefix: | wch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant